Husqvarna 252RX ユーザーズマニュアル

English

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Your Husqvarna product has been designed and 
manufactured to specifications that reduce harmful 
emissions. After the engine has used 8-10 tanks of fuel the 
engine will be run-in. To ensure that it continues to run at peak 
performance and to minimise harmful exhaust emissions 
after the running-in period, ask your dealer/service workshop 
(who will have a rev counter at their disposal) to adjust your 
carburettor.

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The carburettor governs the engine’s speed via the 
throttle control. Air and fuel are mixed in the carburettor. 
The air/fuel mixture is adjustable. Correct adjustment is 
essential to get the best performance from the machine.

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Adjusting the carburettor means that the engine is 
adapted to local operating conditions, e.g. climate, 
altitude, petrol and the type of 2-stroke oil.

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The carburettor has three adjustment controls:  

L = Low speed jet

H = High speed jet

T = Idle adjustment screw

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The L and H-jets are used to adjust the supply of fuel to 
match the rate that air is admitted, which is controlled with 
the throttle. If they are screwed clockwise the air/fuel ratio 
becomes leaner (less fuel) and if they are turned anti-
clockwise the ratio becomes richer (more fuel). A lean 
mixture gives a higher engine speed and a rich mixture 
gives a lower engine speed.

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The T-screw regulates the throttle setting at idle speed. If 
the T-screw is turned clockwise this gives a higher idle 
speed; turning it anti-clockwise gives a lower idle speed.

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The basic carburettor settings are adjusted during testing 
at the factory. The basic setting is richer than the optimal 
setting and should be maintained for the first few hours the 
machine is in use. The carburettor should then be finely 
adjusted. Fine adjustment should be carried out by a 
skilled technician. 

The basic setting can vary between: H = 1 - 1 1/4 turns 
and L = 1 - 1 1/4 turns.

CAUTION!  If the cutting attachment rotates when the engine 
is idling the idle adjustment screw T should be turned anti-
clockwise until the cutting attachment stops.

Rec. idle speed 2700 rpm

Rec. idle speed 2250 rpm

CAUTION!  The machine should only be run for short periods 
at its highest speed. For optimum adjustment of the 
carburettor, contact a qualified dealer/service workshop that 
has a revolution counter at their disposal. 

Recommended max. speed: See the Technical data section.

During the running-in period (8-10 tanks of fuel) the maximum 
speed should be set 600-700 rpm below the recommended 
maximum speed (= open the high speed jet H a further 1/8 
turn).

CAUTION! Some mufflers are fitted with a catalytic converter. 
See chapter on Technical data to see whether your machine 
is fitted with a catalytic converter.

The muffler is designed to reduce the noise level and to direct 
the exhaust gases away from the operator. The exhaust 
gases are hot and can contain sparks, which may cause fire 
if directed against dry and combustible material. Some 
mufflers are equipped with a special spark arrestor mesh. If 
your machine has this type of muffler, you should clean the 
mesh at least once a week. This is best done with a wire 
brush. On mufflers without a catalytic converter the mesh 
should be cleaned weekly, or replaced if necessary. On 
mufflers fitted with a catalytic converter the mesh should be 
checked, and if necessary cleaned, monthly. If the mesh is 
damaged it should be replaced.